Only do fmul (fadd x, x), c combine if the fadd only has one use

This was increasing the instruction count if the fadd has multiple uses.

llvm-svn: 242498

1 files changed, 3 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 465329371f3..f49b53e3b81 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -8138,7 +8138,9 @@ SDValue DAGCombiner::visitFMUL(SDNode *N) {
     // Undo the fmul 2.0, x -> fadd x, x transformation, since if it occurs
     // during an early run of DAGCombiner can prevent folding with fmuls
     // inserted during lowering.
-    if (N0.getOpcode() == ISD::FADD && N0.getOperand(0) == N0.getOperand(1)) {
+    if (N0.getOpcode() == ISD::FADD &&
+        (N0.getOperand(0) == N0.getOperand(1)) &&
+        N0.hasOneUse()) {
       const SDValue Two = DAG.getConstantFP(2.0, DL, VT);
       SDValue MulConsts = DAG.getNode(ISD::FMUL, DL, VT, Two, N1);
       return DAG.getNode(ISD::FMUL, DL, VT, N0.getOperand(0), MulConsts);